"neil f" wrote in message
...

snip

I think I've discovered what my problem is - partly prompted by your
and
Trev's replies. The test file I was using was 4.37GB in size
according to
its properties, which should have fitted ok. But I see that
Wikipedia's DVD
entry says there are two ways of expressing GBs - and that in the
one PCs
use, 4.37GB=4.7GB as far as a DVD is concerned. First I'd heard of
that.

So now I've been progressively frame cutting the file until it
recorded ok
as data. Success occurred at about 4GB in PC properties terms (i.e.
4.2GB
was still too big). So I guess that's the safe limit for my video
file
archiving.


Do remember that there is other data, to do with the optical disc and
how the computer should read it, along side the actual data that the
user puts onto the disc, the capacity (as marked on the disc) is the
total possible and not the usable capacity IYSWIM.